Drilling machine



FIG. 1 is a front perspective view of a drilling machine, showing my newdesign;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof; and

FIG. 6 is a top plan view thereof.

The ornamental design for drilling machine, substantially as shown.